Atmos. Chem. Phys. Discuss., 1, 23-41, 2001
www.atmos-chem-phys-discuss.net/1/23/2001/
doi:10.5194/acpd-1-23-2001
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
298 K rate coefficients for the reaction of OH with i-C3H7I, n-C3H7I and C3H8
S. A. Carl1 and J. N. Crowley2
1Max-Planck-Institut f ¨ ur Chemie, Division of Atmospheric Chemistry, Postfach 3060, D-55020 Mainz, Germany
2Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium

Abstract. The kinetics of the title reactions were investigated using the laser photolysis - resonance fluorescence method, employing the sequential two-photon dissociation of NO2 in the presence of H2 as the OH source. The 298 K rate constant for OH + C3H8 was found to be (1.15±0.1) × 10-12 cm3 s-1, in excellent agreement with the literature recommendation, and with a separate determination using HNO3 photolysis at 248 nm as the OH source. The 298 K rate constants for OH + n-C3H7I and i-C3H7I were measured for the first time and found to be (1.47±0.08) and (1.22±0.06) × 10-12 cm3 s-1, respectively. The errors include an assessment of systematic error due to concentration measurement, which, for the propyl-iodides was minimised by on-line UV-absorption spectroscopy. The implications of these results for the reactive iodine budget of the marine boundary layer are discussed.

Citation: Carl, S. A. and Crowley, J. N.: 298 K rate coefficients for the reaction of OH with i-C3H7I, n-C3H7I and C3H8, Atmos. Chem. Phys. Discuss., 1, 23-41, doi:10.5194/acpd-1-23-2001, 2001.
 
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